The Exploration of SpaceHarper, 1959 - 200 pagini |
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Pagina 15
... distance of a million miles or so . 1 TON TON ICWT . 10 POUNDS • POUND MILES 50 000 100.000 150,000 200.009 DISTANCE FROM CENTER OF EARTH Figure 2. The Reduction of Gravity with Distance ។ This picture of gravity as producing a hill ...
... distance of a million miles or so . 1 TON TON ICWT . 10 POUNDS • POUND MILES 50 000 100.000 150,000 200.009 DISTANCE FROM CENTER OF EARTH Figure 2. The Reduction of Gravity with Distance ។ This picture of gravity as producing a hill ...
Pagina 43
... distance ten thousand times as great . Once again it should be emphasized that , to travel from one planet to another , rocket power need only be used for a few minutes at the beginning and end of the journey . If the initial velocity ...
... distance ten thousand times as great . Once again it should be emphasized that , to travel from one planet to another , rocket power need only be used for a few minutes at the beginning and end of the journey . If the initial velocity ...
Pagina 159
... distance . Our Sun is a quite typical star , although it is a good deal brighter than the average . ( Only three of the twenty nearest stars exceed it in brilliance , and the vast majority are far fainter . ) It is one of a very large ...
... distance . Our Sun is a quite typical star , although it is a good deal brighter than the average . ( Only three of the twenty nearest stars exceed it in brilliance , and the vast majority are far fainter . ) It is one of a very large ...
Cuprins
The Shaping of the Dream | 1 |
Navigation and Communication in Space | 78 |
1 | 118 |
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acceleration airless asteroids astronautics astronomers atmosphere body bricks build carry certainly Chapter chemical completely course crew diameter difficult distance Earth energy engineering enormous escape velocity exploration extremely fact Figure free orbit fuel Galaxy gases gravitational field gravity heat hundred hydrogen imagine important interplanetary flight interplanetary travel interstellar ionosphere journey Jupiter landing LEWIS CARROLL light light-years lunar Mars and Venus Martian means Mercury meteors miles million minutes missiles Moon Moon's motors never normal observed orbit oxygen payload perhaps planetary Plate Pluto possible pounds pressure probably problem produce propellant propulsion Proxima Centauri R. A. Smith radar radiation radio reach reason refueling rocket power satellite Saturn scientific ship Solar System space space-flight space-stations space-suits space-travel spaceship speed spinning stars stations structure sunlight surface take-off tanks telescope temperature thousand thrust trolley Uranus vehicle voyage weight weightless